Non-Christian sources confirm the validity of New Testament
The Jewish historian, Flavius Josephus (A.D. 37-100), is the first non-Christian author to mention Jesus. In the Antiquities, Josephus writes:
There was about this time Jesus, a wise man, if it be lawful to call him a man, for he was a doer of wonderful works—a teacher of such men as receive the truth with pleasure. He drew over to him both many of the Jews, and many of the Gentiles. He was Christ; and when Pilate, at the suggestion of the principal men amongst us, had condemned him to the cross, those that loved him at the first did not forsake him, for he appeared to them alive again the third day, as the divine prophets had foretold these and ten thousand other wonderful things concerning him; and the tribe of Christians, so named from him, are not extinct at this day (Antiquities 18:3:3).
Tacitus (A.D. 56-120), the Roman historian confirms that the crucifixion of Jesus actually took place. Writing in his Annals, he records:
Consequently, to get rid of the report, Nero fastened the guilt and inflicted the most exquisite tortures on a class hated for their abominations, called Christians by the populace. Christus, from whom the name had its origin, suffered the extreme penalty during the reign of Tiberius at the hands of one of our procurators, Pontius Pilatus, and a most mischievous superstition, thus checked for the moment, again broke out not only in Judæa, the first source of the evil, but even in Rome, where all things hideous and shameful from every part of the world find their centre and become popular. Accordingly, an arrest was first made of all who pleaded guilty; then, upon their information, an immense multitude was convicted, not so much of the crime of firing the city, as of hatred against mankind.
Pliny the Younger (A.D. 62-113), Roman governor in Asia Minor, established that early Christians worshiped Jesus as a god:
They (Christians) were in the habit of meeting on a certain fixed day before it was light, when they sang in alternate verses a hymn to Christ, as to a god, and bound themselves by a solemn oath, not to any wicked deeds, but never to commit any fraud, theft or adultery, never to falsify their word, nor deny a trust when they should be called upon to deliver it up; after which it was their custom to separate, and then reassemble to partake of food, but of an ordinary and innocent kind (Epistles 10.96).
Suetonius (120 AD) was a Roman historian and court official. When recounting the history of the emperor Claudius some years before him, he said,
“Because the Jews at Rome caused constant disturbances at the instigation of Chrestus [Christ], he [Claudius] expelled them from the city [Rome]” (Life of Claudius, 25:4).
Lucian, born (c. AD 125 – 180), the pagan author Samosata, while ridiculing Christians, accepted that Jesus actually existed:
The Christians, you know, worship a man to this day—the distinguished personage who introduced their novel rites, and was crucified on that account. … You see, these misguided creatures start with the general conviction that they are immortal for all time, which explains their contempt of death and voluntary self-devotion which are so common among them; and then it was impressed on them by their original lawgiver that they are all brothers, from the moment that they are converted, and deny the gods of Greece, and worship the crucified sage, and live after his laws. All this they take quite on faith, with the result that they despise all worldly goods alike, regarding them merely as common property. (Lucian, The Passing of Peregrinus)
Celsus (2nd century), the Greek philosopher, while arguing against Christianity, also accepted that Jesus existed:
O light and truth! He distinctly declares, with his own voice, as ye yourselves have recorded, that there will come to you even others, employing miracles of a similar kind, who are wicked men, and sorcerers; and Satan. So that Jesus himself does not deny that these works at least are not at all divine, but are the acts of wicked men; and being compelled by the force of truth, he at the same time not only laid open the doings of others, but convicted himself of the same acts. Is it not, then, a miserable inference, to conclude from the same works that the one is God and the other sorcerers? Why ought the others, because of these acts, to be accounted wicked rather than this man, seeing they have him as their witness against himself? For he has himself acknowledged that these are not the works of a divine nature, but the inventions of certain deceivers, and of thoroughly wicked men.
~ Samples, Kenneth Richard. ‘Without a Doubt: Answering the 20 Toughest Faith Questions